A karate expert executes a swift blow and splits a cement block with her hand. The force is high since the momentum is decreased

momentum is increased

mass of the block is so high

time of impact is so low

Aperson walks first at a constant speed of 4.89 m/s along a straight line from point a to point b and then back along the line from b to a at a constant speed of 2.95 m/s. what is the average speed over the entire trip?

The ozone hole appears in antarctica during

If the spring constant k of a pogo stick is 3500 n m and the weight of the person on the pogo stick is 700 n, how much is the spring in the botom of the pogo stick compressed?